若x、y、z满足3x+7y+z=1和4x+10y+z=2001,则分式2000x+2000y+2000z/x+3y的值为_.
问题描述:
若x、y、z满足3x+7y+z=1和4x+10y+z=2001,则分式
的值为______. 2000x+2000y+2000z x+3y
答
由x、y、z满足3x+7y+z=1和4x+10y+z=2001,
得出:
,解得:
2(x+3y)+(x+y+z)=1 3(x+3y)+(x+y+z)=2001
,
x+3y=2000 x+y+z=−3999
∴
=2000x+2000y+2000z x+3y
,2000(x+y+z) x+3y
=
=-3999.2000×(−3999) 2000
故答案为:-3999.